package com.xmx.jd.util;

import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;

/**
 * @Author Xumx
 * @Date 2021/3/17 14:44
 * @Version 1.0
 */
@Component
public class HttpUtils {

    private PoolingHttpClientConnectionManager cm;

    public HttpUtils() {
        this.cm = new PoolingHttpClientConnectionManager();

        //设置最大连接数
        this.cm.setMaxTotal(100);

        //设置每个主机的最大连接数
        this.cm.setDefaultMaxPerRoute(10);
    }

    /*
    *   根据请求地址下载页面数据
    * */
    public String doGetHtml(String url){
        //获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(this.cm).build();

        //创建httpGet请求对象，设置url地址
        HttpGet httpGet = new HttpGet(url);


        httpGet.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0");
        //设置请求信息
        httpGet.setConfig(this.getConfig());


        CloseableHttpResponse response = null;
        //使用HttpClient发起请求，获取响应
        try {
            response = httpClient.execute(httpGet);

            //解析响应，返回结果
            if (response.getStatusLine().getStatusCode() == 200){
                //判断响应体Entity是否不为空，如果不为空就可以使用EntityUtils
                if (response.getEntity() != null){
                    String content = EntityUtils.toString(response.getEntity(), "utf8");
                    return content;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭response
            if (response!=null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        //返回空串
        return "";
    }



    /*
    *   下载图片
    * */
    public String doGetImage(String url){
        //获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(this.cm).build();

        //创建httpGet请求对象，设置url地址
        HttpGet httpGet = new HttpGet(url);

        //设置请求信息
        httpGet.setConfig(this.getConfig());


        CloseableHttpResponse response = null;
        //使用HttpClient发起请求，获取响应
        try {
            response = httpClient.execute(httpGet);

            //解析响应，返回结果
            if (response.getStatusLine().getStatusCode() == 200){
                //判断响应体Entity是否不为空
                if (response.getEntity() != null){
                    //下载图片
                    //获取图片的后缀
                    String extName = url.substring(url.lastIndexOf("."));
                    //创建图片名，重名名图片
                    String picName = UUID.randomUUID().toString()+extName;

                    //下载图片
                    //声明OutPutStream
                    OutputStream outputStream = new FileOutputStream(new File("D:\\code\\java\\code\\heima\\crawler\\crawler_jd\\src\\main\\resources\\images\\"+picName));
                    response.getEntity().writeTo(outputStream);

                    //返回图片名称
                    return picName;

                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭response
            if (response!=null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        //如果下载失败，返回空串
        return "";
    }

    //设置请求的数据信息
    private RequestConfig getConfig() {
        RequestConfig config = RequestConfig.custom()
                .setConnectTimeout(1000)   //创建连接的最长时间
                .setConnectionRequestTimeout(500)   //获取连接的最长时间
                .setSocketTimeout(10000)       //数据传输的最长时间
                .build();
        return config;
    }

}
